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Scientific, Instrument, Chemistry, Model, Molecule, Salt Mineral, Mid 20th Century

Salt Molecule Chemical Model
Germany: Mid 20th Century
Painted wood and metal rods
10 x 10 x 9.5 inches
Prop rental

Available for prop rental. Also available for sale. Please inquire as to rates, mentioning the name of this item in the email.

Model of the molecular structure made as an educational aid for classroom or exhibit. The complex structure is formed from colored wooden balls representing atoms connected by metal rods. This example is a salt model, sodium chloride (NaCl). The cubic model shows the regular lattice structure of salt with four rows of four wooden balls on each side, painted gold and green, and arranged in alternating colors. In one corner of the model, a three by three ball area is connected by bright yellow rods; the rest is connected by gold rods. This presumably illustrates how salt crystals can grow larger. It is not labelled, but probably was made by Leybold’s, Cologne, Germany.

Product description continues below.

Description

Molecule models were available preassembled by various manufacturers or suppliers of school and laboratory equipment based in the United States, England, and Continental Europe. They were also offered unassembled as kits for students. Among the preassembled examples that we frequently offer are those by the British manufacturer Crystal Structures, Ltd, mid 20th Century, often with their label printed “CSL, Bottisham, Cambridge, England” and those by E. Leybold’s Nachfolger, Cologne, generally mid to early 20th century, and sometimes bearing their label.  These molecules are sometimes also identified with a printed or hand-written name on the manufacturer’s label or another label.

The broad incorporation of visual aids such as illustrations and three-dimensional models and devices into classroom teaching, now accepted as commonplace, originated in the mid 19th century. In that period, influential educators advocated their use at all levels of education as a more efficient teaching method than lectures alone. Such devices were particularly popular in the United States and Western Europe. The rationale is succinctly encapsulated by Horace Mann in his Lectures on Education, published in 1845 when he was serving as Secretary of the Massachusetts Board of Education:

“The mind often acquires, by a glance of the eye, what volumes of books and months of study could not reveal so livingly through the ear. Everything that comes through the eye, too, has a vividness, a clear outline, a just collocation of parts, — each in its proper place, which the other senses can never communicate. Ideas or impressions acquired through vision are long-lived.”

Condition: Generally very good with the usual overall light wear to paint and oxidation to metal.

References:

Friedman, Herschel. “The Mineral Barite.” Minerals.net. 1997-2011. http://www.minerals.net/mineral/barite.aspx (14 June 2011).

Mann, Horace. Lectures on Education. Boston: William B. Fowle and N. Capen, 1845. p. 29. Online at Google Books: http://books.google.com/books?id=WfMSAAAAIAAJ (14 June 2011).

Additional information

Century

20th Century